Which Pair of Energy Sources Are Among Those Primarily Responsible

question 79

Multiple Choice

Which pair of energy sources are among those primarily responsible for Earth's external geological processes? 

• A) energy from gravity and magnetism 
• B) energy from the sun and heat from Earth's interior 
• C) energy from the sun and magnetism 
• D) energy from the sun and gravity

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Definitions:

Steering Axle

A rephrased definition: An axle that is designed to pivot and turn the wheels, enabling vehicle steering.

Wide-Base Singles

Single truck tires designed to replace sets of duals on drive and trailer axles. The current generation of these tires is designed to replace duals without incurring a weight reduction penalty.

Duals

A term often referring to the pairing of two tires on each side of an axle, common in heavy-duty vehicles to increase load capacity and stability.

18-Wheeler

A term commonly used to refer to a tractor-trailer or semi-trailer truck, characterized by having a total of eighteen wheels to distribute the weight of heavy loads.